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a. Lead-acid
The specific gravity of the electrolyte is an
indication of the state of charge in what types of
batteries?
a. Lead-acid
b. Nickel-cadmium
c. Neither of these
d. Both A and B
d. The armature
In a DC generator, what part consists of windings
wound around an iron core and the commutator?
a. The field coil
b. The field frame
c. The inverter
d. The armature
c. An aircraft's DC generator must have a slightly higher voltage output than its batteries.
Which of these statements regarding aircraft
batteries and DC generators is true?
a. An aircraft's batteries and DC generator should
have the same voltage output.
b. An aircraft's batteries must have a slightly
higher voltage output than its DC generator.
c. An aircraft's DC generator must have a slightly
higher voltage output than its batteries.
d. Each aircraft electrical system is different, and
it is impossible to generalize.
a. Zener diode
A solid state generator control unit (GCU) almost
always uses this unit to monitor system voltage
and control field current and generator output.
a. Zener diode
b. Capacitor
c. Shunt winding
d. Fuse
b. Field winding
In a DC alternator, this part receives current from
the aircraft battery to produce an electromagnet.
a. Rectifier
b. Field winding
c. Armature
d. Slip rings
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c. Large transport-category aircraft
On which of these aircraft would you be likely to
find an AC alternator?
a. Light aircraft
b. Helicopter
c. Large transport-category aircraft
d. Ultralight
d. Magnetic flux energy
In a brushless alternator, energy from the rotor is
transferred via
a. Slip rings
b. Armature
c. Commutator
d. Magnetic flux energy
b. Voltage and frequency
AC alternator control units must regulate
a. Voltage and current
b. Voltage and frequency
c. Current and resistance
d. Resistance and frequency
a. Current is flowing from the main bus to the battery.
An ammeter connected to the battery circuit will
give a positive indication when
a. Current is flowing from the main bus to the
battery.
b. Current is leaving the battery.
c. The master solenoid is switched on.
d. There are no shorts in the circuit.
c. Limit switches
To monitor the position of each landing gear
during operation, these spring-loaded momentary
contract items are used
a. Avionics buses
b. Squat switches
c. Limit switches
d. Safety switches
a. Three-phase 115-volt AC at 400 Hz
The AC generators on a transport category
aircraft typically produce
a. Three-phase 115-volt AC at 400 Hz
b. Three-phase 120-volt AC at 470 Hz
c. Three-phase 110-volt AC at 360 Hz
d. Four-phase 115-volt AC at 400 Hz
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